Mitsubishi Ex321u St Projector User Manual

							EX321U-ST/EW331U-ST
ENGLISH
DLP™ PROJECTOR
MODEL
EX321U-ST/EW331U-ST
User Manual
This User Manual is important to you.
Please read it before using your projector. 
						

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The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsu-
lated dangerous voltage within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric 
shock. 
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and 
maintenance (servicing) instructions in the literature accompanying the appliance. 
WA R N I N G  Use the attached specified power supply cord. If you use another 
power supply cord, it may cause interference with radio and television 
reception. 
Use the attached RGB cable with this equipment so as to keep interfer-
ence within the limits of an FCC Class B device.
This apparatus must be grounded. 
DO NOT LOOK DIRECTLY INTO THE LENS WHEN THE 
PROJECTOR IS IN THE POWER ON MODE. 
CAUTION Not for use in a computer room as defined in the Standard for the Pro-
tection of Electronic Computer/Data Processing Equipment, ANSI/
NFPA 75. 
The attached power cord is to be used exclusively for this product. 
Never use it for other products.
When using the projector in Europe: 
COMPLIANCE NOTICE 
This Projector complies with the requirements of the EC Directive 
2004/108/EC EMC Directive and 2006/95/EC Low Voltage Direc-
tive. 
The electro-magnetic susceptibility has been chosen at a level that 
gains proper operation in residential areas, on business and light 
industrial premises and on small-scale enterprises, inside as well as 
outside of the buildings. All places of operation are characterized by 
their connection to the public low voltage power supply system. 
WARNING Use the attached RGB cable with this equipment so as to keep interfer-
ence within the limits of an EN55022 Class B device.
When using the projector in South Korea:
WARNING Use the attached RGB cable with this equipment so as to keep interfer-
ence within the limits of a K00022 Class B device.
Please follow WARNING instructions.
WA R N I N G :  TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE. 
CAUTION: TO PREVENT ELECTRIC SHOCK, DO NOT USE THIS (POLARIZED) PLUG WITH AN EXTENSION CORD, RECEPTACLE OR OTHER OUT-
LET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE EXPOSURE. 
NOTE:SINCE THIS PROJECTOR IS PLUGGABLE EQUIPMENT, THE SOCKET-OUTLET SHALL BE INSTALLED NEAR THE EQUIPMENT AND 
SHALL BE EASILY ACCESSIBLE. 
CAUTION: TO REDUCE THE RISK OF ELECTRIC
SHOCK,
DO NOT REMOVE COVER (OR BACK)
NO USER-SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN 
						

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ENGLISH
WA R N I N G
• The lens cap is for protecting the lens. If you leave the lens cap on 
the lens with the projector turned on, it may be deformed because of 
heat build-up. Remove the lens cap when you turn on the projector. 
• One of power cords for the U.S., Europe/Indonesia, U.K., Australia, 
South Korea and Argentina is provided appropriately.
• This projector uses the power plug of three-pin grounding type. Do 
not remove the grounding pin from the power plug. If the power plug 
doesn’t fit your wall outlet, ask an electrician to change the wall out-
let. 
• In case that the power cord for the U.S. is provided with this projec-
tor, never connect this cord to any outlet or power supply using other 
voltages or frequencies than rated. If you want to use a power sup-
ply using other voltage than rated, prepare an appropriate power 
cord separately. 
• Use 100-240 V AC 50/60 Hz to prevent fire or electric shock. • Do not place any objects on the power cord or do not place the pro-
jector near heat sources to prevent damage to the power cord. If the 
power cord should be damaged, contact your dealer for replace-
ment because it may cause fire or electric shock. 
• Do not modify or alter the power cord. If the power cord is modified 
or altered, it may cause fire or electric shock.  Note:This symbol mark is for EU 
countries only.
This symbol mark is according to 
the directive 2002/96/EC Article 10 
Information for users and Annex 
IV, and/or to the directive 2006/66/
EC Article 20 Information for end-
users and Annex II.Your MITSUBISHI ELECTRIC product is designed and manufactured with high quality 
materials and components which can be recycled and/or reused.
This symbol means that electrical and electronic equipment, batteries and accumula-
tors, at their end-of-life, should be disposed of separately from your household waste.
If a chemical symbol is printed beneath the symbol shown above, this chemical sym-
bol means that the battery or accumulator contains a heavy metal at a certain concen-
tration. This will be indicated as follows:
Hg: mercury (0,0005%), Cd: cadmium (0,002%), Pb: lead (0,004%)
In the European Union there are separate collection systems for used electrical and 
electronic products, batteries and accumulators.
Please, dispose of this equipment, batteries and accumulators correctly at your local 
community waste collection/recycling centre.
Please, help us to conserve the environment we live in! 
						

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Contents
Important safeguards ............................................................................................................................. 5
Projector exterior view .......................................................................................................................... 7
Controls and functions ........................................................................................................................... 8
Positioning your projector ................................................................................................................... 11
Connection ........................................................................................................................................... 16
Operation ............................................................................................................................................. 21
Adjusting the projected image ............................................................................................................. 25
Optimizing the image .......................................................................................................................... 28
3D ........................................................................................................................................................ 34
Supervising and controlling by computer ............................................................................................ 36
Menu operation .................................................................................................................................... 41
Maintenance......................................................................................................................................... 47
Lamp information ................................................................................................................................ 48
Indicators ............................................................................................................................................. 53
Troubleshooting ................................................................................................................................... 54
Specifications....................................................................................................................................... 55
Trademark, Registered trademark Macintosh is registered trademark of Apple Computer Inc.
DLP™, Digital Micromirror Device, DMD, and BrilliantColor™ are all trademarks of Texas Instruments.
HDMI, the HDMI logo and High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC.
Microsoft, Windows, Windows XP, Windows Vista, and Internet Explorer are registered trademarks, trademarks, or trade names of Microsoft Corpo-
ration in the U.S. and/or other countries.
Other brand or product names are trademarks or registered trademarks of their respective holders. 
Declaration of Conformity Model Number: EX321U-ST/EW331U-ST
Trade Name: MITSUBISHI ELECTRIC 
Responsible party: Mitsubishi Electric Visual Solutions America, Inc. 
9351 Jeronimo Road, Irvine, CA 92618 U.S.A 
Telephone number: +1-(949) 465-6000 
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: 
(1) this device may not cause harmful interference, and 
(2) this device must accept any interference received, including interference that may cause undesired operation.  
						

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ENGLISH
Important safeguards
Please read all these instructions regarding your projector and retain 
them for future reference. Follow all warnings and instructions marked 
on the projector. 
1. Read instructions 
All the safety and operating instructions should be read before 
the appliance is operated. 
2. Retain instructions 
The safety and operating instructions should be retained for 
future reference. 
3. Warnings 
All warnings on the appliance and in the operating instructions 
should be adhered to. 
4. Instructions
All operating instructions must be followed. 
5. Cleaning
Unplug this projector from the wall outlet before cleaning it. Do 
not use liquid aerosol cleaners. Use a damp soft cloth for clean-
ing. 
6. Attachments and equipment 
Never add any attachments and/or equipment without the 
approval of the manufacturer as such additions may result in the 
risk of fire, electric shock or other personal injury. 
7. Water and moisture 
Do not use this projector near water or in contact with water. 
8. Accessories
Do not place this projector on an unstable cart, stand, tripod, 
bracket or table. Use only with a cart, stand, tripod bracket, or 
table recommended by the manufacturer or sold with the projec-
tor. Any mounting of the appliance should follow the manufac-
turer’s instructions and should use a mounting accessory 
recommended by the manufacturer. 
An appliance and cart combination should be moved with care. 
Quick stops, excessive force and uneven surfaces may cause the 
appliance and cart combination to overturn. 
9. Ventilation 
Slots and openings in the cabinet are provided for ventilation, 
ensuring reliable operation of the projector and to protect it from 
overheating. Do not block these openings or allow them to be 
blocked by placing the projector on a bed, sofa, rug, or bookcase. 
Ensure that there is adequate ventilation and that the manufac-
turer’s instructions have been adhered to. 
10. Power sources 
This projector should be operated only from the type of power 
source indicated on the marking label. If you are not sure of the 
type of power, please consult your appliance dealer or local 
power company. 
11. Power-cord protection 
Power-supply cords should be routed so that they are not likely to 
be walked on or pinched by items placed upon or against them. 
Pay particular attention to cords at plugs, convenience recepta-
cles, and points where they exit from the appliance. Do not put 
the power cord under a carpet. 12. Overloading 
Do not overload wall outlets and extension cords as this can 
result in a fire or electric shock. 
13. Objects and liquids 
Never push objects of any kind through openings of this projector 
as they may touch dangerous voltage points or short-out parts 
that could result in a fire or electric shock. Never spill liquid of any 
kind on the projector. 
14. Servicing 
Do not attempt to service this projector yourself. Refer all servic-
ing to qualified service personnel. 
15. Damage requiring service 
Unplug this projector from the wall outlet and refer servicing to 
qualified service personnel under the following conditions: 
(a) If the power-supply cord or plug is damaged. 
(b) If liquid has been spilled, or objects have fallen into the pro-
jector. 
(c) If the projector does not operate normally after you follow the 
operating instructions. Adjust only those controls that are 
covered by the operating instructions. An improper adjust-
ment of other controls may result in damage and may often 
require extensive work by a qualified technician to restore 
the projector to its normal operation. 
(d) If the projector has been exposed to rain or water. 
(e) If the projector has been dropped or the cabinet has been 
damaged. 
(f) If the projector exhibits a distinct change in performance - 
this indicates a need for service. 
16. Replacement parts 
When replacement parts are required, be sure that the service 
technician has used replacement parts specified by the manufac-
turer or parts having the same characteristics as the original part. 
Unauthorized substitutions may result in fire, electric shock or 
other hazards. 
17. Safety check 
Upon completion of any service or repair to this projector, ask the 
service technician to perform safety checks determining that the 
projector is in a safe operating condition.  
						

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WA R N I N G :  
Unplug immediately if there is something wrong with 
your projector.
Do not operate if smoke, strange noise or odor comes out of your pro-
jector. It may cause fire or electric shock. In this case, unplug immedi-
ately and contact your dealer. 
Never remove the cabinet. This projector contains high voltage circuitry. An inadvertent contact 
may result in an electric shock. Except as specifically explained in User 
Manual, do not attempt to service this product by yourself. Please con-
tact your dealer when you want to fix, adjust, or inspect the projector. 
Do not modify the projector. It can lead to fire or electric shock. 
Do not keep using the damaged projector. If the projector is dropped and the cabinet is damaged, unplug the pro-
jector and contact your dealer for inspection. It may lead to fire if you 
keep using the damaged projector. 
Do not face the projection lens to the sun. It can lead to fire. 
Use correct voltage. If you use incorrect voltage, it can lead to fire. 
Do not place the projector on uneven surface. Place the projector on a level and stable surface only.
Do not look into the lens when the projector is operating. It may hurt your eyes. Never let children look into the lens when the 
projector is on. 
Do not unplug the power cord during operation. It can lead to lamp breakage, fire, electric shock or other trouble. Wait 
for the fan to stop before unplugging the power cord.
Do not touch the air outlet grilles and bottom plate. Do not touch them or put other equipment close to the air outlet grilles 
because they become hot during operation. The heated air outlet 
grilles and bottom plate may cause injury or damage to other equip-
ment. Also, do not put the projector on a desk that is easily affected by 
heat. 
Do not look into the air outlet grilles when projector is 
operating. 
Heat, dust, etc. may blow out of them and hurt your eyes. 
Do not block the air inlet and outlet grilles. If they are blocked, heat may be generated inside the projector, caus-
ing deterioration in the projector quality and fire. 
Do not use flammable solvents (benzene, thinner, etc.) 
and flammable aerosols near the projector.
Flammable substances may ignite causing fire or breakdown because 
the temperature inside the projector rises very high while the lamp is 
illuminating.
Do not use the projector with condensation on it.It can lead to breakdown or other failure.
Place of installation For safety’s sake, do not use the projector at any place subjected to 
high temperature and high humidity. Please maintain an operating tem-
perature, humidity, and altitude as specified below. 
• Operating temperature: between +41°F (+5°C) and +95°F (+35°C) 
• Operating humidity: between 30% and 90% 
• Never put any heat-producing device under the projector to prevent 
the projector from being overheated. 
• Do not install the projector at a place that is unstable or subject to 
vibration. 
• Do not install the projector near any equipment that produces a 
strong magnetic field. Also refrain from installing the projector near 
any cable carrying a large amount of current. 
• Place the projector on a solid, vibration-free surface. Otherwise it 
may fall, causing serious injury or damage. 
• Do not stand the projector on its end. It may fall, causing serious 
injury or damage. 
• Slanting the projector more than ±10° (right and left) or ±15° (front 
and rear) may cause trouble or explosion of the lamp. 
• Do not place the projector near air-conditioning unit, heater, or 
humidifier to avoid hot or moist air to the exhaust and ventilation 
hole of the projector.
• Be sure to use this projector at an altitude of less than 1500 meters.
COMPLIANCE NOTICE OF FCC This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These 
limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses 
and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to 
radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause 
harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try 
to correct the interference by one or more of the following measures: 
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced Radio / TV technician for help. 
Any changes or modifications not expressly approved by Mitsubishi could void the user’s authority to operate this equipment.
COMPLIANCE NOTICE OF INDUSTRY CANADA This Class B digital apparatus complies with Canadian ICES-003.  
						

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ENGLISH
Projector exterior view
1. External control panel 
(See Projector on page 8 for details.)
2. Lamp cover
3. Vent (heated air exhaust)
4. Quick-release button
5. Lens cover
6. Focus ring
7. Front IR remote sensor
8. Projection lens
9. Vent (air intake)
Do not replace the lamp immediately after using the projector 
because the lamp would be extremely hot and it may cause 
burns.
10. RGB signal output socket
11. RGB (PC)/Component Video (YPbPr/ YCbCr) signal 
input socket x 2
12. HDMI input port
13. Serial control port
14. LAN (RJ-45) port
15. Audio input jack
Audio output jack
16. S-Video input socket
Video input socket
17. Kensington lock
18. AC power cord inlet
19. Quick-release foot
20. Security bar
21. Rear adjuster foot
Kensington Lock
This projector has a Kensington Security Standard connector 
for use with Kensington MicroSaver Security System.
Refer to the information that came with the Kensington System 
for instructions on how to use it to secure the projector. Please 
contact Kensington Technology Group below.
Kensington Technology Group
2855 Campus Drive
San Mateo, CA 94403, U.S.A.
Phone: +1- (650)572-2700 Fax: +1- (650)572-9675
Front/upper side
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Rear/lower side
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Controls and functions
Projector
1. Focus ring
Adjusts the focus of the projected image. See Fine-
tuning the image size and clarity on page 25 for details.
2. POWER indicator light
Lights up or flashes when the projector is under 
operation. See Indicators on page 53 for details.
3. SOURCE
Displays the source selection bar. See Switching input 
signal on page 24 for details.
4. Left/BLANK
Used to hide the screen picture. See Hiding the image 
on page 32 for details.
5. MODE/ENTER
Selects an available picture setup mode. See Selecting a 
picture mode on page 28 for details.
Enacts the selected On-Screen Display (OSD) menu 
item.
6. MENU/EXIT
Turns on the On-Screen Display (OSD) menu. Goes 
back to previous OSD menu, exits and saves menu 
settings. See Using the menus on page 22 for details.
7. TEMPerature indicator light
Lights up red if the projectors temperature becomes too 
high. See Indicators on page 53 for details.
8. LAMP indicator light
Indicates the status of the lamp. Lights up or flashes 
when the lamp has developed a problem. See 
Indicators on page 53 for details.
9. AUTO
Automatically determines the best picture timings for the 
displayed image. See Auto-adjusting the image on 
page 25 for details.
10. Keystone/Arrow keys ( / Up,  / Down)
Manually corrects distorted images resulting from an 
angled projection. See Correcting keystone on page 25
for details.
11 . R i g h t0
Activates panel key lock. See Locking control keys on 
page 32 for details.
When the On-Screen Display (OSD) menu is activated, 
the #4, #10, and #11 keys are used as directional arrows 
to select the desired menu items and to make 
adjustments. See Using the menus on page 22 for 
details.
12. POWER (ON/STANDBY)
Toggles the projector between standby mode and on. See 
Starting up the projector on page 21 andShutting 
down the projector on page 33 for details.
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ENGLISH
Remote control
1. POWER (ON/STANDBY)
Toggles the projector between standby mode and on. See 
Starting up the projector on page 21andShutting 
down the projector on page 33for details.
2. FREEZE
Freezes the projected image. See Freezing the image 
on page 32 for details.
3. Left
Selects the desired menu items and makes adjustments. 
See Using the menus on page 22 for details.
4. BLANK
Used to hide the screen picture. See Hiding the image 
on page 32 for details.
5. VOLUME keys (+, -)
Adjusts the sound level. See Adjusting the sound on 
page 32 for details.
6. MAGNIFY keys (+, -)
Magnifies or reduces the projected picture size. See 
Magnifying and searching for details on page 26 for 
details.
7. MENU/EXIT
Turns on the On-Screen Display (OSD) menu. Goes 
back to previous OSD menu, exits and saves menu 
settings. See Using the menus on page 22 for details.
8. Keystone/Arrow keys ( / Up,  / Down)
Manually corrects distorted images resulting from an 
angled projection. See Correcting keystone on page 25
for details.
9. AUTO
Automatically determines the best picture timings for the 
displayed image. See Auto-adjusting the image on 
page 25 for details.
10. Right0
Activates panel key lock. See Locking control keys on 
page 32 for details.
When the On-Screen Display (OSD) menu is activated, 
the #3, #8 and #10 keys are used as directional arrows to 
select the desired menu items and to make adjustments. 
See Using the menus on page 22 for details.
11. SOURCE
Displays the source selection bar. See Switching input 
signal on page 24 for details.
12. MODE/ENTER
Depending upon which input signal is selected, selects 
an available picture setup mode. See Selecting a picture 
mode on page 28 for details. 
Enacts the selected On-Screen Display (OSD) menu 
item.
13. TIMER ON
Activates or displays an on-screen timer based on your 
own timer setting. See Setting the presentation timer 
on page 31 for details.
14. TIMER SET UP
Enters presentation timer setting directly. See Setting 
the presentation timer on page 31 for details.
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Using the remote control for the first time
Pull the tab before using the remote control.
Remote control effective range
Infra-Red (IR) remote control sensor is located on the front of the projector. The 
remote control must be held at an angle within 30 degrees perpendicular to the 
projectors IR remote control sensor to function correctly. The distance between 
the remote control and the sensor should not exceed 8 meters (~ 26 feet).
Make sure that there are no obstacles between the remote control and the IR 
sensor on the projector that might obstruct the infra-red beam.
• Do not let the IR transmitter of the remote control be shined by sunlight or 
fluorescent lamps directly.
• Please keep the remote controller away from fluorescent lamps for over 2 m or 
the remote controller might become malfunction.
• If the remote control is close to Inverter-Type fluorescent lamps, it might become ineffective from time to time.
• If the remote control and the projector are within a very short distance, the remote control might become ineffective.
• When you aim at the screen, the effective distance is less than 5 m from the remote control to the screen and reflecting 
the IR beams back to the projector. However, the effective range might change according to screens.
Replacing the remote control battery
1. Pull out the battery holder.
Please follow the illustrated instructions. Push and hold the locking arm while pulling 
out the battery holder.
2. Insert the new battery in the holder. Note the positive polarity should face 
outward.
3. Push the holder into the remote control.
• Risk of explosion if battery is replaced by an incorrect type.
• Dispose of used batteries according to the instructions.
• Use of a battery of wrong type may cause explosion. Use Lithium coin battery, 
type CR2025 only.
• Dispose of used batteries according to your local regulations. Discard used battery promptly. Batteries may explode if 
mistreated. Do not recharge, disassemble, or dispose of in fire.
• Be careful in handling the battery according to the instructions.
• Load the battery with its positive (+) and negative (-) sides correctly oriented as indicated on the remote control.
• Keep batteries out of reach of children and pets.
• Remove the battery if the remote control is not used for a long time.
• Keep battery in original package until ready to use.
• Never put battery in mouth for any reason as it can easily be accidentally swallowed. If battery is accidentally swallowed, 
contact your physician or your poison control center.
• Dispose of the used battery with cellophane tape wrapping both ends of it.
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